JB/T 7105-2002 General technical requirements for complete set of centralized control protection panels, cabinets and platforms for 35KV substations
Some standard content:
ICS29.240.30
Machinery Industry Standard of the People's Republic of China JB/T7105—2002
Replaces JB/T7105—1993
General Technical Requirements for Complete Sets of Centralized Control and Protection Panels, Cabinets and Platforms for 35kV Substations (Substations)
Issued on July 16, 2002
Implementation on December 1, 2002
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword
JB/T7105—2002
This standard is revised on the basis of JB/T7105-1993 (General Technical Requirements for Complete Sets of Centralized Control and Protection Panels, Cabinets and Platforms for 35kV Substations (Substations)) (hereinafter referred to as the original standard). Compared with JB/T7105-1993, the main changes of this standard are as follows: The referenced standards are changed to the latest versions:
- The writing format is in accordance with GB/T1.1--2000 "Guidelines for Standardization Part 1: Structure and Writing Rules of Standards" and GB/T1.2-2002 "Guidelines for Standardization Part 2: Methods for Determining Normative Technical Elements and Contents in Standards"; - The protection level requirements are changed to those in GB4208-1993; "5.23 Ability to withstand fast transient interference" is added; The dimensions in the structural requirements Limit deviations and geometric tolerances are added in accordance with GB/T1800.3-1998 and GB/T1184-1996:
Chapter 8 of the original standard is changed to "8 Marking, labeling, instruction manual", and the basic requirements for instruction manuals are added; -Chapter 9 of the original standard is changed to "9 Packaging, transportation, storage"; "10 Completeness of supply" is added:
"Quality assurance" is added;
"Appendix A" in the original standard is removed
This standard replaces JB7105-1993.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Measuring Relays and Protection Equipment. The drafting unit of this standard: Xuchang Relay Research Institute. The drafter of this standard: Li Shaofeng.
This standard was first issued in 1993.
JB/T7105—2002
General technical conditions for complete set of centralized control protection screens, cabinets and platforms for 35kV substations (stations) 1 Scope
This standard specifies the technical requirements, test methods and inspection rules for complete set of centralized control protection screens, cabinets and platforms for 35kV substations (stations). This standard applies to complete set of centralized control protection screens, cabinets and platforms (hereinafter referred to as products) for 35kV substations (stations) as the basis for design and production inspection.
Complete set of centralized control protection means: using a reasonable wiring scheme to integrate control (including remote control), protection, measurement, metering, signal, communication, DC power supply and other functions together, through reasonable combination, installed in a screen (cabinet) or desktop structure. Control and protection functions are generally realized by integrated circuits or microcomputers.
2 Normative reference documents
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties that reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version is applicable to this standard. GB/T1184—1996 Tolerances of shape and position without tolerance value (eqoISO2768-1:1989) GBT1800.3—1998 Basis of limits and fits Part 3: Table of values of standard tolerances and basic deviations (eqvISO286-1:1988) GB/T1720—1979 Determination of adhesion of paint films Colors of indicator lights and buttons in electrical complete sets GB/T2682—1981
GB4208—1993 Degrees of protection of enclosures (IP code) (eqvIEC60529:1989) GB4884—1985
Marking of insulated wires (eqvec60391:1972) GB/T7261—2000
Basic principles of relays and devices This test method
Basic dimensions of electrical control consoles for secondary circuits of power systems GB/T7266—1987
GB/T7267—1987
GB9969.1—1998
Basic dimensions of control, protection panels and cabinets for secondary circuits of power systems General provisions for the instruction manual of industrial products
GB/T11287-2000 Electrical relays Part 21: Vibration, shock, impact and earthquake tests on measuring relays and protection devices Part I: Vibration test (sinusoidal) (idtEC60255-21-1:1988) GB/T14537-1993 Shock and impact tests on measuring relays and protection devices (idtEC60255-21-2) GB/T14598 .9-1995 Electrical relays Part 22: Electrical disturbance tests for measuring relays and protection devices Part 3: Radiated electromagnetic field disturbance tests (idtIEC60255-22-3:1989) GB/T14598.10-1996 Electrical relays Part 22: Electrical disturbance tests for measuring relays and protection devices Part 4: Fast transient disturbance tests (idtIEC60255-22-4:1992) GB/T14598.13-1998 Electrical disturbance tests for measuring relays and protection devices Part 1: 1MHz pulse group disturbance test (eqvIEC60255-22-1:1988)
GB/T14598.14-1998 Electrical disturbance tests for measuring relays and protection devices Part 1: 1MHz pulse group disturbance test (eqvIEC60255-22-1:1988)
GB/T14598.15-1998 Electrical disturbance tests for measuring relays and protection devices Part 2: 1MHz pulse group disturbance test (eqvIEC60255-22-2:1988)
GB/T14598.16-1998 Electrical disturbance tests for measuring relays and protection devices Part 3: Radiated electromagnetic field disturbance test (idtIEC60255-22-3:1989) Part 2: Electrostatic discharge test (idtEC60255-22-2:1996)
GB16836-1997 General requirements for safety design of measuring relays and protection devices JB/T5777.3-2002 Basic test methods for control and relay protection panels (cabinets and platforms) for secondary circuits in power systems JB/T9568-2000 General technical conditions for relays, protection and automatic devices in power systems JB/T7828-1995 Technical conditions for packaging, storage and transportation of relays and their devices IEC60255-5:2001 Insulation coordination requirements and tests for measuring relays and protection equipment 1
JB/T7105—2002
3 Rated parameters
The product input circuit rating should be selected from the following values. AC voltage: 100/V3V, 100V, 220V, 380Va)wwW.bzxz.Net
AC current: 1A, 5A;
Power frequency: 50Hz;
d)DC voltage: 48V, 110V, 220V. If the rated parameters other than those listed above are required, the user shall negotiate with the manufacturer to determine 4 Conditions of use
Normal conditions of use
The product should be able to be used normally under the following conditions. 4.1.1
Environmental temperature
Selected in the following range:
0～45℃, 5℃～+40℃ (for static products with requirements on environmental temperature): ～10℃～+50℃ (or +55℃) (for static products with no requirements on environmental temperature): -25℃～+40℃, 25℃～+55℃ (for electromechanical and rectifier products): The average temperature within 24h is not higher than 35℃.
Products with special requirements on environmental temperature shall be specified by product standards. 4.1.2Relative temperature
a) When the highest temperature is 40℃. The average maximum relative humidity shall not exceed 50%: b) The average maximum relative humidity of the wettest month is 90%, and the average minimum humidity of the month is 25℃, with no condensation on the surface. 4.1.3Atmospheric pressure
The atmospheric pressure is 80kPa~110kPa.
4.1.4 Working position
Vertical ground installation.
4.1.5 External magnetic field magnetic induction intensity
No more than 0.5mT in any direction.
4.1.6 Power supply variation range
AC power supply variation range:
a) Voltage variation is 85%~110% of the rated value: b) Frequency variation is 50Hz±1Hz,
DC voltage variation range:
When the rated voltage is 110V and 220V, the variation range is 80%~110% of the rated value; a)
b) When the rated voltage is 48V, the variation range is 90%~110% of the rated value. Other requirements for the use place
According to JB/T9568--2000, 5.3 Provisions
2 Special conditions of use
a) When the normal use conditions specified in this standard are exceeded (such as outdoor use or conditions with corrosion, explosion hazard, etc.), the user should propose it to the manufacturer when placing an order and negotiate a solution; products used in tropical environmental conditions should not only meet these conditions, but also meet the requirements of tropical environmental conditions for products. b)
5 Technical requirements
Structural requirements
5.1.1 The structural design of the product should take into account the requirements for component installation, wiring, operation and maintenance. JB/T7105—2002
5.1.2 The appearance and installation dimensions of the screen and cabinet should comply with the requirements of GB/T7267-1987; the dimensions of height×width×depth of 2300mm×800mm×550mm (600mm) can be selected according to user needs, but it is not a recommended dimension. The appearance dimensions of the table should comply with the requirements of GB7266-1987.
5.1.3 The structure should be made of materials that can withstand the mechanical, electrical and thermal stresses of the product and should have sufficient strength and rigidity. Large openings or continuous openings on the panel should be reinforced, and the installation of large components (such as relay protection boxes) should be strengthened. 5.1.4 The limit deviation of the external dimensions of the screen and cabinet structure should meet the following requirements: when the height is 1600mm~2000mm, ±1.5mm, ±2mm; when the height is greater than 2000mm, ±2mm, ±2.5mm; the width is -mm, -2mm
and the depth is ±1.5mm;
The limit deviation of the size of the table is not specified for the time being. 5.1.5 The geometric tolerances of the product should meet the following requirements: 5.1.5.1 Flatness of the panel: (口1000:2) mm. 5.1.5.2 Verticality: (1000:2) mm 5.1.5.3 The position accuracy of the panel opening is 0.5 mm, and the size tolerance of the hole should meet the installation requirements of the components. 5.1.6 The product structure should consider the following basic measures: Anchor installation hole and screen assembly hole:
Lifting facilities for convenient product transportation:
Threading holes for debugging and inspection wiring, which should be covered with nameplates or other decorations when not in use. Safety grounding measures and ensure the continuity of the protection circuit. The grounding connection should have anti-rust and anti-pollution measures, and the grounding should have obvious markings:
e) The enclosure protection level should comply with the provisions of GB4208-1993. 5.1.7 Other requirements:
5.1.7.1 The structure should be neat and beautiful after assembly, and each weld should be free of defects such as cracks, burn-through, undercut, air edge, slag inclusion, etc., and the welding slag should be removed.
5.1.7.2 Each fastening connection should be firm and reliable, and all fasteners should have anti-corrosion plating or coating. Fastening connections must be prevented from loosening, and copper materials must be used for parts that are both connected and conductive (except for connectors that constitute protection circuits). 5.1.7.3 The gaps of each joint and door should be symmetrical, and the door should be opened and closed flexibly and locked reliably. The opening angle of the door should not be less than 90°. If the user requires it, a limit mechanism should be installed. 5.1.7.4 When adding lighting equipment according to user needs, the bulbs should be able to be replaced safely without interrupting the normal operation of the equipment. 5.1.7.5 The flip-up angle of the table screen or table should not be less than 45°. After the flip-up, there should be a positioning mechanism to facilitate maintenance and repair. The design of the flip-up structure should consider minimizing the installation restricted area of the components. 5.1.7.6 For current and voltage measurement circuits, there should be facilities for interchange and inspection under working conditions (such as test wiring sockets or test terminals). 5.1.7.7 If the user needs to set up an automatic heating device, it should be specified in the enterprise product standard. 5.2 Requirements for surface coating and system simulation diagram 5.2.1 All surfaces of the product to be coated should be pre-treated before coating. The color of the surface coating should meet the user's requirements (the user can provide a color code) or be specified by the relevant enterprise standards. 5.2.2 The coating layer should have good adhesion, be uniform and smooth, and no defects such as sagging, shrinkage, and shrinkage holes are allowed. The surface should not glare, so as not to affect the monitoring effect.
5.2.3 When there is a system simulation diagram, it should be marked according to the color specified in Table 1 according to the operating voltage level. 5.2.4 The width of the simulated busbar on the screen (cabinet) is 12mm, the width of the longitudinal branch simulation line is 8mm, and the width of each simulation graphic line is 8mm. In principle, the width of the simulated busbar and branch simulation line on the platform is the same as the screen. However, for products with denser components, the width of the simulated busbar is 3
JB/T7105--2002
8mm, the width of the vertical branch simulated line is 6mm, and the width of each simulated graphic line is 6mm. If there are special requirements, it shall be determined by negotiation between the user and the manufacturer.
Operating voltage level and corresponding simulated line color Operating voltage type and level
DC voltage
Deep blue
5.2.5 The simulated line should be firmly attached, not easy to break, the color should be evenly drawn, the layout should be symmetrical and beautiful, and the drawing of the simulated graphics should comply with the relevant standards. The height of the same simulated busbar of two adjacent screens (cabinets) in the same group of products should be consistent, and the width and color of the simulated lines and simulated graphic lines with the same function should be consistent.
5.3 Component installation requirements
5.3.1 The parts installed in the product should have a product certificate or a document proving the quality. Components that have been issued product and production licenses should also provide corresponding certificates or signs and be installed in accordance with the manufacturer's instructions. Obsolete, backward and high-energy-consuming components must not be used.
In the strong current system, the selected weak current components should be protected by double insulation. 5.3.3 The color of display components and strong current buttons should be selected according to their use in accordance with the provisions of GB/T2682-1981, and weak current buttons should have obvious functional signs.
Components are generally not arranged within 250mm from the ground of the panel (cabinet). 5.3.4
Components and terminal blocks installed after the product should not hinder the maintenance of other components. The components should be arranged neatly and in clear layers. 5.3.6 For components that are powered on for a long time and generate heat, their temperature rise should meet their own technical standards. The installation position should be close to the top. According to their power size, they should maintain a gap of not less than 20mm from surrounding components and wire bundles to ensure that surrounding components and wire bundles are not affected. 5.3.7 The distance between two exposed live conductors or between an exposed live conductor and an exposed non-live conductor shall comply with the requirements for electrical clearance and creepage distance specified in 5.15. The electrical clearance between the small busbars, busbars or exposed live conductors of different levels installed on the top of the screen, and between the exposed live conductors and uninsulated non-live conductors shall not be less than 12mm, and the creepage distance shall not be less than 20mm.
3 Electrical components, small busbar seats, busbars or terminal blocks shall have text symbols (or numbers, marks) 5.3.8
marked in accordance with the requirements of the design drawings, and shall be clear, durable and easy to observe. 5.4 Requirements for busbars and connecting wires
The phase sequence and color of the small busbars and wires of the main circuit shall comply with the provisions of Table 2. Table 2 Small busbars, conductor phase sequence and color group of main circuit
Neutral
Safety grounding wire
Protective grounding, PE
Painting color
(or insulated conductor color)
Yellow-green double color
Note: The installation position is based on the front view direction of the panel and cabinet. 4
Vertical arrangement
Mutual position of busbar installation
Front and rear arrangement
Horizontal arrangement
5.4.2 Except for special circumstances, the relationship between the cross-sectional area of the connecting wire selected in the product and the rated value is shown in Table 3. Table 3 Relationship between the cross-sectional area of the connecting wire and the rated value Circuit characteristics
AC voltage circuit V
DC voltage circuit V
AC current circuit A
DC current circuit A
100~380
JB/T7105—2002
The cross-sectional area of the copper core wire is not less than mm2
: 48V and below are allowed to use wires with a nominal cross-sectional area of 0.2mm22~1mm\, except for the connecting wires in the device and the box and the belt-mounted relay. 5.5 Number of insulated wires connected
5.5.1 The arrangement of the wires should be horizontal and vertical, the layout should be reasonable, the layout should be neat and beautiful, and the wiring method of the wire trough is recommended. When using the wire trough for wiring, the configuration of the wire trough should be reasonable, the fixation should be reliable, and the wire trough cover should have good opening and closing performance. 5.5.2 The clamps for bundling the wires should be strong and reliable, and should not damage the external insulation of the wires. It is prohibited to bundle the wire harness with nylon wire or other materials that are easy to damage the insulation. For wire harnesses composed of wires with a nominal cross-sectional area of 1.5mm and above, the number of wires should generally not exceed 30. Brackets or wire clamps for fixing the wire harness should be installed in the product. 5.5.3. For the connection between the wire and the component terminal or terminal block, it is recommended to use BVR soft wire for wires with a cross-section of 6mm2 or less, and cold-pressed terminals should be used; for wires with a cross-section of 10mm2 or more, multi-strand hard wires can be used, and their terminals should be crimped by cold-pressing pliers. The cold-pressed connection should be reliable and have good contact. The wire terminals should be marked with identification marks, and the wire markings should comply with the provisions of GB4884-1985. 5.5.4 When wiring in a movable place, such as connecting wires across doors or flaps, multi-strand copper core insulated soft wires must be used, with a certain length margin, and protected by winding tapes, etc. to avoid any mechanical damage. At the same time, measures should be taken to fix the wire harness. 5.5.5 No joints are allowed in the middle of the connecting wires, and each terminal is not allowed to connect more than two wires, and measures should be taken to ensure reliable connection.
5.5.6 The wire harness cannot be laid close to the metal structure. When crossing the metal bearing component, measures should be taken to protect the wire insulation from damage. 5.5.7 The distance between the terminal row and the rear end of the panel (cabinet) is generally not less than 160mm. When two rows of terminal rows need to be installed on the same side, the spacing between them should be not less than 100mm, and the distance between the rear terminal row and the rear end of the panel (cabinet) should be not less than 75mm to facilitate cable laying. 5.5.8 When the user requires the use of a small busbar with a bare conductor, small busbar terminal blocks that can pass through a 6mm diameter steel rod should be provided on both sides of the upper part of the panel (cabinet). The installation position of the first section of the small busbar from the panel (cabinet) to the back should be not less than 75mm from the panel (cabinet). If the user has no other requirements, small busbar terminals are installed in the row panel to achieve communication through cables to improve operational reliability. 5.5.9 The location, width and distance from the ground of the grounding busbar shall be determined by the user and the manufacturer as needed. 5.6 Measures for preventing electric shock
There are two types of measures for preventing electric shock: direct electric shock and indirect electric shock. The requirements are as follows: 5.6.1
a) Prevention of direct electric shock is to prevent the human body from making dangerous contact with live conductive parts; b) Prevention of indirect electric shock is to prevent the human body from making dangerous contact with exposed non-live conductive parts. 5.6.2 Protection against direct electric shock should be considered from a structural perspective, such as adding isolation baffles, protective doors, and insulation protection. 5.6.3 Protection against indirect electric shock should be provided by protective circuits. The protection circuit is composed of a separate protection conductor or conductive structural parts (or both) to prevent the expansion of internal faults of the product and the expansion of external circuit faults associated with the product, and should meet the following requirements:
Ensure the electrical continuity between the exposed non-live conductive parts of the product and between them and the protection circuit. The resistance between any grounding point in the product and the main grounding point should not be greater than 0.12; the exposed non-live conductive parts may not be connected to the protection circuit under the following circumstances: they cannot be grasped by hand, and the exposed non-live conductive parts are less than b)
50mm×50mm, or exclude the possibility of contact with it; 5
JB/T7105--2002
c) Manual operating devices should be safely and reliably connected to the protection circuit, or effectively insulated from non-charged conductive parts. Insulation methods such as paint cannot be considered to meet the above requirements; d) The continuity of the protection circuit should be ensured by effective wiring, which can be connected by direct wiring or protective conductor connection: e) For structural parts such as doors, covers, and coverings, if there are no electrical components installed on them, general metal screws or metal hinges are considered sufficient to ensure electrical continuity. If electrical components exceeding the safety voltage are installed on them, protective measures should be taken to connect them to the protection circuit with protective conductors. The cross-sectional area of the protective conductor should not be less than the cross-sectional area of the lead from the power supply to the electrical component: f)
When using the components of the product as the protection circuit components, the cross-sectional area of the wire is selected according to Table 4, or it can be selected by calculation method g) When using the components of the product as the protection circuit components, the connection points of the protection circuit should be marked with eye-catching symbols. Table 4 Conductor cross-sectional area
Unit: mm2
Conductor cross-sectional area S on the circuit
16≤35
5.7 Basic functional requirements for various basic relays used in the product Various basic relays installed in the product should meet the requirements of the product design drawings. 5.8 Basic functional requirements for electrical components used in the product Minimum cross-sectional area of the corresponding protective conductor
5.8.1 The electrical components used in the product include various operating components such as buttons and switches, various measuring components such as instruments, and various sound and light signal indicating components
5.8.2 The models and specifications of various electrical components used in the product must meet the requirements of the product design drawings. 5.8.3 Various operating components such as buttons and switches should not have carding or operation failure after five simulated operations. 5.8.4
When a certain amount of electricity is applied to various measuring components such as instruments, they should indicate the corresponding electricity value and should not fail or indicate errors.
All kinds of sound, light and other signal indicating components should be able to correctly reflect the corresponding working status of the product and display clearly. Manual analog indicators 5.8.5
should be flexible to operate and correctly reflect the various working status of analog circuits and components. 5.8.6 For electrical components with setting mechanisms, after five manual settings, there should be no jamming or operational failure. The setting method should be flexible, convenient and reliable.
5.8.7 For electrical components with other mechanical functions, they should meet their functional requirements. 5.9 Basic functional requirements of products
5.9.1 Differential and overload protection
5.9.1.1 The consistency or error of setting range and action setting value shall meet the following requirements: Differential protection setting range: 2.5A7.5A
The consistency of differential protection action setting range value shall not exceed 5%, and the average error shall not exceed 5%: Overload protection setting range: 2A～7.5A; c)
The consistency of overload protection action setting range value shall not exceed 5%, and the average error shall not exceed 5%. 5.9.1.2
The braking coefficient of differential protection shall meet the following requirements: Differential protection braking coefficient: 0.3~0.7;
Differential protection harmonic braking ratio: 0.15～0.30. Return coefficient: not less than 0.8.
The action time shall meet the following requirements:
The differential protection shall not exceed 40ms at 2 times the action current. The consistency of the action time is not more than 5%, and the average error is not more than 5%. a)
Overload protection does not exceed 5s~10s at 1.2 times the action current. The consistency of the delay setting value is not more than 5%, and the average error does not exceed b)
JB/T7105—2002
5.9.1.5 Power consumption: At the rated value, the power consumption of the AC circuit is not more than 3VA for the differential circuit: not more than 2VA for the brake circuit. 5.9.2 Overcurrent quick-break protection
5.9.2.1 Setting range and consistency error of action setting value shall meet the following requirements: a):
Overcurrent protection setting range: 2A~20A;
Overcurrent protection action setting value consistency is not more than 5%, and the average error does not exceed 5%; Quick-break protection setting range: 5A~30A;
Quick-break protection action setting value consistency is not more than 5%, and the average error does not exceed 5%: d)
Delay setting range: 0.2s~1.5s:
The consistency of the delay setting value of the delay action is not more than 5%, and the average error does not exceed 5% The action time of quick-break protection without time limit: not more than 40ms at 2 times the action current. The consistency of the action time is not more than 5%, and the average 5.9.2.2
error does not exceed 5%.
5.9.2.3 Return coefficient: not less than 0.85. Power consumption: not more than 3VA (under rated current conditions) in AC circuit. 5.9.2.4
5.9.3 Zero-sequence voltage protection
5.9.3.1 Setting range and consistency or error of action setting value shall meet the following requirements: Zero-sequence voltage protection setting range: 5V~40V: a)
The consistency of zero-sequence voltage protection action setting value shall not exceed 5%, and the average error shall not exceed 5%. : Zero-sequence voltage protection action time: not more than 0.5s at 1.2 times the action setting value. 5.9.3.2
Power consumption: not more than 2.5VA (under rated voltage conditions) in AC circuit. Return coefficient: not less than 0.85.
5.9.4 Compound voltage start overcurrent protection
5.9.4.1 Overcurrent setting range: 2.0A~6.0A (0.5A is a step difference), the consistency of the action setting value is not more than 5%, and the average error does not exceed 5%.
5.9.4.2 Low voltage setting range: 30V~50V, the consistency of the action setting value is not more than 5%, and the average error does not exceed 5%. 5.9.4.3
Negative sequence voltage setting range: 6V16V, the consistency of the action setting value is not more than 5%, and the average error does not exceed 5%. 5.9.4.4 Delay setting range of delayed action: 0.2s~10s, consistency of delay setting value is not more than 5%, and the average error is not more than 5%. 5.9.4.5 Power consumption: At rated value, the AC current circuit is not more than 3VA, and the AC voltage circuit is not more than 3VA. 5.9.5 Capacitor protection
5.9.5.1 Overcurrent protection setting range: 2A~20A: Delay setting range; 0.5s~2s; Consistency is not more than 5%, and the average error is not more than ±5%.
5.9.5.2 Overvoltage protection setting range: 110V~150V: Delay setting range: 0.5s~2s: Consistency is not more than 5%, and the average error is not more than ±5%.
5.9.5.3 Undervoltage protection setting range: 40V~80V; Delay setting range: 0.5s2s: Consistency is not more than 5%, and the average error is not more than 5%.
5.9.6 Three-phase primary reclosing
5.9.6.1 It shall have the function of three-phase primary reclosing, and the reclosing delay setting range shall be: 0.5s~1s; the consistency shall not exceed 5%, and the average error shall not exceed 5%.
5.9.6.2 The post-acceleration memory time shall not be less than 1s. 5.9.6.3 The closing pulse time shall ensure reliable closing of the switch. 5.9.7 Central signal
5.9.7.1 Accident sound signal timing: 7s~15s. 5.9.7.2 Advance sound signal timing: 7s~15s. 5.9.8 DC power supply
JB/T7105-2002
It shall meet the functional requirements of power supply stability, reliability, ripple factor, etc. specified in the relevant standards. 5.9.9 For microcomputer protection with printing function
, the printing cycle and accuracy shall be specified in the product enterprise standard. 5.9.10 The product should have a self-checking function
5.9.11 Function setting
When the user needs it, power direction protection, low-frequency load reduction, monitoring, telemetry, telesignaling interface and anti-misoperation functions can be set. The functional requirements of the product shall be determined by the enterprise and the user through negotiation. 5.9.12 Device fault alarm
When the hardware of the protection device fails, the display element shall display the fault information, drive the alarm element to alarm, and lock the control output circuit of the protection.
5.9.13 Network communication
Microcomputer products should have network communication functions and can communicate directly with microcomputer monitoring or protection management machines. The communication interface is specified by the enterprise product standards.
5.9.14 Impact of ambient temperature changes on main performance When the ambient temperature is the limit value specified in 4.1.1, the variation of the main functions of the product under the reference temperature (20℃±2℃) shall meet the following requirements:
The variation of the action setting value of differential protection shall not exceed 5%: a)
The variation of the action setting value of overload protection and overcurrent protection shall not exceed 5%: The variation of the two-stage current action setting value, quick-break action setting value and delay setting value of overcurrent quick-break protection shall not exceed 5%: c)
The variation of the action setting value of zero-sequence voltage protection shall not exceed 5% d)
The variation of the action setting value of capacitor protection shall not exceed 5%: f) The variation of the delay setting value of three-phase primary reclosing shall not exceed 5%; g) The accident sound and warning sound can correctly send out sound signals. The variation of other functions shall be specified by the enterprise product standards. 5.10 Insulation performance
5.10.1 Insulation performance assessment
Unless otherwise specified, the atmospheric conditions for insulation performance assessment shall not exceed the following ranges: a) Ambient temperature is 15℃～35℃;
b) Relative humidity is 45%～75%
c) Atmospheric pressure is 86kPa～106kPa. The insulation performance assessment is carried out when the product is naturally dry and there is no self-heating. 5.10.2 Insulation resistance
The insulation resistance of the relevant parts shall be measured with a test instrument with an open circuit voltage of 500V, which shall comply with the following provisions. a) The insulation resistance between the live circuit and the ground (i.e. the metal frame) shall not be less than 5M2 b) The insulation resistance between the live circuits without electrical connection shall not be less than 10MS2. 5.10.3 Dielectric strength
5.10.3.1 The following parts of the product shall be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. the metal frame); b) Between the AC circuit and the DC circuit.
5.10.3.2 Dielectric strength test voltage value: The parts listed in 5.10.3.1 shall withstand the sine wave test voltage value listed in Table 5 with a frequency of 50Hz±5Hz. During the test lasting 1min, the insulation shall not show breakdown or flashover.
Rated insulation voltage
>60~250
>250~500
Table 5 Sine wave test voltage value
Test voltage kV
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During sampling test and factory test, it is allowed to use a test voltage of 110% of that specified in Table 5. The test lasts for 1s, and the insulation should not show breakdown or flashover.
5.10.3.3 When half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source should be kept less than 10%, and the power supply voltage should ensure an accuracy of not less than 5%.
5.10.3.4 For circuits directly excited by mutual inductance, the test voltage should be not less than 2.0kV. 5.10.3.5 When testing between two circuits that are always at the same potential (for example, directly connected to the same phase), the test voltage should be twice the rated insulation voltage value, but not less than 500V. 5.10.4 Impulse voltage
The product should be able to withstand a short-term impulse voltage test with a standard lightning wave amplitude of 5kV between each live circuit and the ground (i.e., the metal frame). After withstanding the impulse voltage, the main functions of the product should meet the requirements of the factory test items. During the test, flashovers that do not damage the insulation are allowed. If flashover occurs, the insulation resistance and dielectric strength should be rechecked, and the dielectric strength test voltage is 75% of the specified value. 5.11 Resistance to moisture and heat
The product is subjected to an alternating damp heat test at a maximum temperature of 40°C and a test cycle of two cycles (48h). No excitation is applied. Within 2h before the end of the test, the insulation resistance value of the specified parts in 5.10.2 is measured with a test instrument with an open circuit voltage of 500V. It should not be less than 0.5M2. The dielectric strength between each live circuit and the ground (i.e., the metal frame) is 75% of the specified test voltage value. After the test, the appearance quality is checked. There should be no rust or shedding of the surface coating. Note: If there are other requirements for the insulation resistance value, they can be specified in the enterprise product standard. 5.12 Power consumption
The total power consumption of the product is specified by the enterprise product standard. 5.13 Thermal performance
5.13.1 Temperature rise
The temperature rise of each part of the product should not exceed the provisions of Table 6. Table 6 Temperature rise
Unit; K
Components installed inside
Contactable metal surface of shell and cover plate
Insulation surface
According to enterprise standards
Components installed inside refer to relays, relay protection and control devices, commonly used switching elements and control elements, electronic components, etc. Unless otherwise specified, the temperature rise of the shell and cover plate that can be touched but not touched during normal operation is allowed to be 10K higher than the data in the table. 5.13.2 Short-term heat resistance limit
The current circuit directly connected to the current transformer shall be able to withstand an impact of 20 times the rated current for 1s without insulation damage. 5.14 Dynamic stability
The current circuit directly connected to the current transformer shall be able to withstand an impact of 50 times the rated current for 10ms without insulation damage, and the coil and structural parts shall have no permanent deformation. 5.15 Electrical and creepage distances
According to the provisions of EC60255-5:2001.
5.16 Effect of interruption of auxiliary excitation on performance 96.1 It shall have a three-phase primary reclosing function, and the reclosing delay setting range is: 0.5s~1s; the consistency shall not exceed 5%, and the average error shall not exceed 5%.
5.9.6.2 The post-acceleration memory time shall not be less than 1s. 5.9.6.3 The closing pulse time shall ensure reliable closing of the switch. 5.9.7 Central signal
5.9.7.1 Accident sound signal timing: 7s~15s. 5.9.7.2 Advance sound signal timing: 7s~15s. 5.9.8 DC power supply
JB/T7105-2002
Should meet the functional requirements of power supply stability, reliability, ripple factor, etc. specified in the relevant standards. 5.9.9 For microcomputer protection with printing function
, the printing cycle and accuracy shall be specified in the product enterprise standard. 5.9.10 The product should have a self-checking function
5.9.11 Function setting
When the user needs it, power direction protection, low-frequency load reduction, monitoring, telemetry, telesignaling interface and anti-misoperation functions can be set. The functional requirements of the product shall be determined by the enterprise and the user through negotiation. 5.9.12 Device fault alarm
When the hardware of the protection device fails, the display element shall display the fault information, drive the alarm element to alarm, and lock the control output circuit of the protection.
5.9.13 Network communication
Microcomputer products should have network communication functions and can communicate directly with microcomputer monitoring or protection management machines. The communication interface is specified by the enterprise product standards.
5.9.14 Impact of ambient temperature changes on main performance When the ambient temperature is the limit value specified in 4.1.1, the variation of the main functions of the product under the reference temperature (20℃±2℃) shall meet the following requirements:
The variation of the action setting value of differential protection shall not exceed 5%: a)
The variation of the action setting value of overload protection and overcurrent protection shall not exceed 5%: The variation of the two-stage current action setting value, quick-break action setting value and delay setting value of overcurrent quick-break protection shall not exceed 5%: c)
The variation of the action setting value of zero-sequence voltage protection shall not exceed 5% d)
The variation of the action setting value of capacitor protection shall not exceed 5%: f) The variation of the delay setting value of three-phase primary reclosing shall not exceed 5%; g) The accident sound and warning sound can correctly send out sound signals. The variation of other functions shall be specified by the enterprise product standards. 5.10 Insulation performance
5.10.1 Insulation performance assessment
Unless otherwise specified, the atmospheric conditions for insulation performance assessment shall not exceed the following ranges: a) Ambient temperature is 15℃～35℃;
b) Relative humidity is 45%～75%
c) Atmospheric pressure is 86kPa～106kPa. The insulation performance assessment is carried out when the product is naturally dry and there is no self-heating. 5.10.2 Insulation resistance
The insulation resistance of the relevant parts shall be measured with a test instrument with an open circuit voltage of 500V, which shall comply with the following provisions. a) The insulation resistance between the live circuit and the ground (i.e. the metal frame) shall not be less than 5M2 b) The insulation resistance between the live circuits without electrical connection shall not be less than 10MS2. 5.10.3 Dielectric strength
5.10.3.1 The following parts of the product shall be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. the metal frame); b) Between the AC circuit and the DC circuit.
5.10.3.2 Dielectric strength test voltage value: The parts listed in 5.10.3.1 shall withstand the sine wave test voltage value listed in Table 5 with a frequency of 50Hz±5Hz. During the test lasting 1min, the insulation shall not show breakdown or flashover.
Rated insulation voltage
>60~250
>250~500
Table 5 Sine wave test voltage value
Test voltage kV
JB/T7105——2002
During sampling test and factory test, it is allowed to use a test voltage of 110% of that specified in Table 5. The test lasts for 1s, and the insulation should not show breakdown or flashover.
5.10.3.3 When half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source should be kept less than 10%, and the power supply voltage should ensure an accuracy of not less than 5%.
5.10.3.4 For circuits directly excited by mutual inductance, the test voltage should be not less than 2.0kV. 5.10.3.5 When testing between two circuits that are always at the same potential (for example, directly connected to the same phase), the test voltage should be twice the rated insulation voltage value, but not less than 500V. 5.10.4 Impulse voltage
The product should be able to withstand a short-term impulse voltage test with a standard lightning wave amplitude of 5kV between each live circuit and the ground (i.e., the metal frame). After withstanding the impulse voltage, the main functions of the product should meet the requirements of the factory test items. During the test, flashovers that do not damage the insulation are allowed. If flashover occurs, the insulation resistance and dielectric strength should be rechecked, and the dielectric strength test voltage is 75% of the specified value. 5.11 Resistance to moisture and heat
The product is subjected to an alternating damp heat test at a maximum temperature of 40°C and a test cycle of two cycles (48h). No excitation is applied. Within 2h before the end of the test, the insulation resistance value of the specified parts in 5.10.2 is measured with a test instrument with an open circuit voltage of 500V. It should not be less than 0.5M2. The dielectric strength between each live circuit and the ground (i.e., the metal frame) is 75% of the specified test voltage value. After the test, the appearance quality is checked. There should be no rust or shedding of the surface coating. Note: If there are other requirements for the insulation resistance value, they can be specified in the enterprise product standard. 5.12 Power consumption
The total power consumption of the product is specified by the enterprise product standard. 5.13 Thermal performance
5.13.1 Temperature rise
The temperature rise of each part of the product should not exceed the provisions of Table 6. Table 6 Temperature rise
Unit; K
Components installed inside
Contactable metal surface of shell and cover plate
Insulation surface
According to enterprise standards
Components installed inside refer to relays, relay protection and control devices, commonly used switching elements and control elements, electronic components, etc. Unless otherwise specified, the temperature rise of the shell and cover plate that can be touched but not touched during normal operation is allowed to be 10K higher than the data in the table. 5.13.2 Short-term heat resistance limit
The current circuit directly connected to the current transformer shall be able to withstand an impact of 20 times the rated current for 1s without insulation damage. 5.14 Dynamic stability
The current circuit directly connected to the current transformer shall be able to withstand an impact of 50 times the rated current for 10ms without insulation damage, and the coil and structural parts shall have no permanent deformation. 5.15 Electrical and creepage distances
According to the provisions of EC60255-5:2001.
5.16 Effect of interruption of auxiliary excitation on performance 96.1 It shall have a three-phase primary reclosing function, and the reclosing delay setting range is: 0.5s~1s; the consistency shall not exceed 5%, and the average error shall not exceed 5%.
5.9.6.2 The post-acceleration memory time shall not be less than 1s. 5.9.6.3 The closing pulse time shall ensure reliable closing of the switch. 5.9.7 Central signal
5.9.7.1 Accident sound signal timing: 7s~15s. 5.9.7.2 Advance sound signal timing: 7s~15s. 5.9.8 DC power supply
JB/T7105-2002
Should meet the functional requirements of power supply stability, reliability, ripple factor, etc. specified in the relevant standards. 5.9.9 For microcomputer protection with printing function
, the printing cycle and accuracy shall be specified in the product enterprise standard. 5.9.10 The product should have a self-checking function
5.9.11 Function setting
When the user needs it, power direction protection, low-frequency load reduction, monitoring, telemetry, telesignaling interface and anti-misoperation functions can be set. The functional requirements of the product shall be determined by the enterprise and the user through negotiation. 5.9.12 Device fault alarm
When the hardware of the protection device fails, the display element shall display the fault information, drive the alarm element to alarm, and lock the control output circuit of the protection.
5.9.13 Network communication
Microcomputer products shall have network communication functions and can communicate directly with microcomputer monitoring or protection management machines. The communication interface is specified by the enterprise product standards.
5.9.14 Impact of ambient temperature changes on main performance When the ambient temperature is the limit value specified in 4.1.1, the variation of the main functions of the product under the reference temperature (20℃±2℃) shall meet the following requirements:
The variation of the action setting value of differential protection shall not exceed 5%: a)
The variation of the action setting value of overload protection and overcurrent protection shall not exceed 5%: The variation of the two-stage current action setting value, quick-break action setting value and delay setting value of overcurrent quick-break protection shall not exceed 5%: c)
The variation of the action setting value of zero-sequence voltage protection shall not exceed 5% d)
The variation of the action setting value of capacitor protection shall not exceed 5%: f) The variation of the delay setting value of three-phase primary reclosing shall not exceed 5%; g) The accident sound and warning sound can correctly send out sound signals. The variation of other functions shall be specified by the enterprise product standards. 5.10 Insulation performance
5.10.1 Insulation performance assessment
Unless otherwise specified, the atmospheric conditions for insulation performance assessment shall not exceed the following ranges: a) Ambient temperature is 15℃～35℃;
b) Relative humidity is 45%～75%
c) Atmospheric pressure is 86kPa～106kPa. The insulation performance assessment is carried out when the product is naturally dry and there is no self-heating. 5.10.2 Insulation resistance
The insulation resistance of the relevant parts shall be measured with a test instrument with an open circuit voltage of 500V, which shall comply with the following provisions. a) The insulation resistance between the live circuit and the ground (i.e. the metal frame) shall not be less than 5M2 b) The insulation resistance between the live circuits without electrical connection shall not be less than 10MS2. 5.10.3 Dielectric strength
5.10.3.1 The following parts of the product shall be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. the metal frame); b) Between the AC circuit and the DC circuit.
5.10.3.2 Dielectric strength test voltage value: The parts listed in 5.10.3.1 shall withstand the sine wave test voltage value listed in Table 5 with a frequency of 50Hz±5Hz. During the test lasting 1min, the insulation shall not show breakdown or flashover.
Rated insulation voltage
>60~250
>250~500
Table 5 Sine wave test voltage value
Test voltage kV
JB/T7105——2002
During sampling test and factory test, it is allowed to use a test voltage of 110% of that specified in Table 5. The test lasts for 1s, and the insulation should not show breakdown or flashover.
5.10.3.3 When half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source should be kept less than 10%, and the power supply voltage should ensure an accuracy of not less than 5%.
5.10.3.4 For circuits directly excited by mutual inductance, the test voltage should be not less than 2.0kV. 5.10.3.5 When testing between two circuits that are always at the same potential (for example, directly connected to the same phase), the test voltage should be twice the rated insulation voltage value, but not less than 500V. 5.10.4 Impulse voltage
The product should be able to withstand a short-term impulse voltage test with a standard lightning wave amplitude of 5kV between each live circuit and the ground (i.e., the metal frame). After withstanding the impulse voltage, the main functions of the product should meet the requirements of the factory test items. During the test, flashovers that do not damage the insulation are allowed. If flashover occurs, the insulation resistance and dielectric strength should be rechecked, and the dielectric strength test voltage is 75% of the specified value. 5.11 Resistance to moisture and heat
The product is subjected to an alternating damp heat test at a maximum temperature of 40°C and a test cycle of two cycles (48h). No excitation is applied. Within 2h before the end of the test, the insulation resistance value of the specified parts in 5.10.2 is measured with a test instrument with an open circuit voltage of 500V. It should not be less than 0.5M2. The dielectric strength between each live circuit and the ground (i.e., the metal frame) is 75% of the specified test voltage value. After the test, the appearance quality is checked. There should be no rust or shedding of the surface coating. Note: If there are other requirements for the insulation resistance value, they can be specified in the enterprise product standard. 5.12 Power consumption
The total power consumption of the product is specified in the enterprise product standard. 5.13 Thermal performance
5.13.1 Temperature rise
The temperature rise of each part of the product should not exceed the provisions of Table 6. Table 6 Temperature rise
Unit; K
Components installed inside
Contactable metal surface of shell and cover plate
Insulation surface
According to enterprise standards
Components installed inside refer to relays, relay protection and control devices, commonly used switching elements and control elements, electronic components, etc. Unless otherwise specified, the temperature rise of the shell and cover plate that can be touched but not touched during normal operation is allowed to be 10K higher than the data in the table. 5.13.2 Short-term heat resistance limit value
The current circuit directly connected to the current transformer shall be able to withstand an impact of 20 times the rated current for 1s without insulation damage. 5.14 Dynamic stability
The current circuit directly connected to the current transformer shall be able to withstand an impact of 50 times the rated current for 10ms without insulation damage, and the coil and structural parts shall have no permanent deformation. 5.15 Electrical and creepage distances
According to the provisions of EC60255-5:2001.
5.16 Effect of interruption of auxiliary excitation on performance 91, the variation of the main functions of the product under the reference temperature (20℃±2℃) should meet the following requirements:
The variation of the action setting value of differential protection does not exceed 5%: a)
The variation of the action setting value of overload protection and overcurrent protection does not exceed 5%: the variation of the two-stage current action setting value, quick-break action setting value and delay setting value of overcurrent quick-break protection does not exceed 5%: c)
The variation of the action setting value of zero-sequence voltage protection does not exceed 5% d)
The variation of the action setting value of capacitor protection does not exceed 5%: f) The variation of the delay setting value of three-phase primary reclosing does not exceed 5%; g) The accident sound and warning sound can send out sound signals correctly. The variation of other functions shall be specified by the enterprise product standards. 5.10 Insulation performance
5.10.1 Insulation performance assessment
Unless otherwise specified, the atmospheric conditions for insulation performance assessment shall not exceed the following ranges: a) Ambient temperature is 15℃～35℃;
b) Relative humidity is 45%～75%
c) Atmospheric pressure is 86kPa～106kPa. The insulation performance assessment is carried out when the product is naturally dry and there is no self-heating. 5.10.2 Insulation resistance
The insulation resistance of the relevant parts shall be measured with a test instrument with an open circuit voltage of 500V, which shall comply with the following provisions. a) The insulation resistance between the live circuit and the ground (i.e. the metal frame) shall not be less than 5M2 b) The insulation resistance between the live circuits without electrical connection shall not be less than 10MS2. 5.10.3 Dielectric strength
5.10.3.1 The following parts of the product shall be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. the metal frame); b) Between the AC circuit and the DC circuit.
5.10.3.2 Dielectric strength test voltage value: The parts listed in 5.10.3.1 shall withstand the sine wave test voltage value listed in Table 5 with a frequency of 50Hz±5Hz. During the test lasting 1min, the insulation shall not show breakdown or flashover.
Rated insulation voltage
>60~250
>250~500
Table 5 Sine wave test voltage value
Test voltage kV
JB/T7105——2002
During sampling test and factory test, it is allowed to use a test voltage of 110% of that specified in Table 5. The test lasts for 1s, and the insulation should not show breakdown or flashover.
5.10.3.3 When half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source should be kept less than 10%, and the power supply voltage should ensure an accuracy of not less than 5%.
5.10.3.4 For circuits directly excited by mutual inductance, the test voltage should be not less than 2.0kV. 5.10.3.5 When testing between two circuits that are always at the same potential (for example, directly connected to the same phase), the test voltage should be twice the rated insulation voltage value, but not less than 500V. 5.10.4 Impulse voltage
The product should be able to withstand a short-term impulse voltage test with a standard lightning wave amplitude of 5kV between each live circuit and the ground (i.e., the metal frame). After withstanding the impulse voltage, the main functions of the product should meet the requirements of the factory test items. During the test, flashovers that do not damage the insulation are allowed. If flashover occurs, the insulation resistance and dielectric strength should be rechecked, and the dielectric strength test voltage is 75% of the specified value. 5.11 Resistance to moisture and heat
The product is subjected to an alternating damp heat test at a maximum temperature of 40°C and a test cycle of two cycles (48h). No excitation is applied. Within 2h before the end of the test, the insulation resistance value of the specified parts in 5.10.2 is measured with a test instrument with an open circuit voltage of 500V. It should not be less than 0.5M2. The dielectric strength between each live circuit and the ground (i.e., the metal frame) is 75% of the specified test voltage value. After the test, the appearance quality is checked. There should be no rust or shedding of the surface coating. Note: If there are other requirements for the insulation resistance value, they can be specified in the enterprise product standard. 5.12 Power consumption
The total power consumption of the product is specified in the enterprise product standard. 5.13 Thermal performance
5.13.1 Temperature rise
The temperature rise of each part of the product should not exceed the provisions of Table 6. Table 6 Temperature rise
Unit; K
Components installed inside
Contactable metal surface of shell and cover plate
Insulation surface
According to enterprise standards
Components installed inside refer to relays, relay protection and control devices, commonly used switching elements and control elements, electronic components, etc. Unless otherwise specified, the temperature rise of the shell and cover plate that can be touched but not touched during normal operation is allowed to be 10K higher than the data in the table. 5.13.2 Short-term heat resistance limit value
The current circuit directly connected to the current transformer shall be able to withstand an impact of 20 times the rated current for 1s without insulation damage. 5.14 Dynamic stability
The current circuit directly connected to the current transformer shall be able to withstand an impact of 50 times the rated current for 10ms without insulation damage, and the coil and structural parts shall have no permanent deformation. 5.15 Electrical and creepage distances
According to the provisions of EC60255-5:2001.
5.16 Effect of interruption of auxiliary excitation on performance 91, the variation of the main functions of the product under the reference temperature (20℃±2℃) should meet the following requirements:
The variation of the action setting value of differential protection does not exceed 5%: a)
The variation of the action setting value of overload protection and overcurrent protection does not exceed 5%: the variation of the two-stage current action setting value, quick-break action setting value and delay setting value of overcurrent quick-break protection does not exceed 5%: c)
The variation of the action setting value of zero-sequence voltage protection does not exceed 5% d)
The variation of the action setting value of capacitor protection does not exceed 5%: f) The variation of the delay setting value of three-phase primary reclosing does not exceed 5%; g) The accident sound and warning sound can correctly send out sound signals. The variation of other functions shall be specified by the enterprise product standards. 5.10 Insulation performance
5.10.1 Insulation performance assessment
Unless otherwise specified, the atmospheric conditions for insulation performance assessment shall not exceed the following ranges: a) Ambient temperature is 15℃～35℃;
b) Relative humidity is 45%～75%
c) Atmospheric pressure is 86kPa～106kPa. The insulation performance assessment is carried out when the product is naturally dry and there is no self-heating. 5.10.2 Insulation resistance
The insulation resistance of the relevant parts shall be measured with a test instrument with an open circuit voltage of 500V, which shall comply with the following provisions. a) The insulation resistance between the live circuit and the ground (i.e. the metal frame) shall not be less than 5M2 b) The insulation resistance between the live circuits without electrical connection shall not be less than 10MS2. 5.10.3 Dielectric strength
5.10.3.1 The following parts of the product shall be subjected to dielectric strength test: a) Between each live circuit and the ground (i.e. the metal frame); b) Between the AC circuit and the DC circuit.
5.10.3.2 Dielectric strength test voltage value: The parts listed in 5.10.3.1 shall withstand the sine wave test voltage value listed in Table 5 with a frequency of 50Hz±5Hz. During the test lasting 1min, the insulation shall not show breakdown or flashover.
Rated insulation voltage
>60~250
>250~500
Table 5 Sine wave test voltage value
Test voltage kV
JB/T7105——2002
During sampling test and factory test, it is allowed to use a test voltage of 110% of that specified in Table 5. The test lasts for 1s, and the insulation should not show breakdown or flashover.
5.10.3.3 When half of the specified voltage value is applied to the tested product, the voltage drop of the test voltage source should be kept less than 10%, and the power supply voltage should ensure an accuracy of not less than 5%.
5.10.3.4 For circuits directly excited by mutual inductance, the test voltage should be not less than 2.0kV. 5.10.3.5 When testing between two circuits that are always at the same potential (for example, directly connected to the same phase), the test voltage should be twice the rated insulation voltage value, but not less than 500V. 5.10.4 Impulse voltage
The product should be able to withstand a short-term impulse voltage test with a standard lightning wave amplitude of 5kV between each live circuit and the ground (i.e., the metal frame). After withstanding the impulse voltage, the main functions of the product should meet the requirements of the factory test items. During the test, flashovers that do not damage the insulation are allowed. If flashover occurs, the insulation resistance and dielectric strength should be rechecked, and the dielectric strength test voltage is 75% of the specified value. 5.11 Resistance to moisture and heat
The product is subjected to an alternating damp heat test at a maximum temperature of 40°C and a test cycle of two cycles (48h). No excitation is applied. Within 2h before the end of the test, the
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